怎么不顯示出來(lái)效果呀？
<script type="text/javascript">
?//創(chuàng)建數(shù)組
?var arr["*","##","***","&&","****","&&*"]
?arr[7]="**";
?//顯示數(shù)組長(zhǎng)度
?document.write(arr.length);
?
?//將數(shù)組內(nèi)容輸出，完成達(dá)到的效果。
document.write(arr[0]+"<br/>");
document.write(arr[7]+"<br/>");
document.write(arr[2]+"<br/>");
document.write(arr[4]+"<br/>");
</script>
2019-04-20
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>數(shù)組</title>
<script type="text/javascript">
?var arr=["*","##","***","&&","****","##"];
?arr[7]="**";//創(chuàng)建數(shù)組
?alert("數(shù)組arr的長(zhǎng)度為："+arr.length);//彈框輸出數(shù)組長(zhǎng)度
</script>
</head>
<body>
</body>
</html>
2019-03-16
你好，創(chuàng)建數(shù)組時(shí)語(yǔ)法錯(cuò)誤；var arr后要加上“=”。